linux-kernel - Re: [RFC PATCH 14/39] KVM: guest_memfd: hugetlb: initialization and cleanup

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Message-ID: <CAGtprH-xw9DFwheTicNStXKhMJTsuXviBnq1PwvrxEHMNkb83A@mail.gmail.com>
Date: Fri, 20 Sep 2024 11:17:45 +0200
From: Vishal Annapurve <vannapurve@...gle.com>
To: Ackerley Tng <ackerleytng@...gle.com>
Cc: tabba@...gle.com, quic_eberman@...cinc.com, roypat@...zon.co.uk, 
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	kvm@...r.kernel.org, linux-kselftest@...r.kernel.org, linux-fsdevel@...ck.org
Subject: Re: [RFC PATCH 14/39] KVM: guest_memfd: hugetlb: initialization and cleanup

On Wed, Sep 11, 2024 at 1:44 AM Ackerley Tng <ackerleytng@...gle.com> wrote:
>
> ...
> +}
> +
> +static void kvm_gmem_evict_inode(struct inode *inode)
> +{
> +       u64 flags = (u64)inode->i_private;
> +
> +       if (flags & KVM_GUEST_MEMFD_HUGETLB)
> +               kvm_gmem_hugetlb_teardown(inode);
> +       else
> +               truncate_inode_pages_final(inode->i_mapping);
> +
> +       clear_inode(inode);
> +}
> +
>  static const struct super_operations kvm_gmem_super_operations = {
>         .statfs         = simple_statfs,
> +       .evict_inode    = kvm_gmem_evict_inode,

Ackerley, can we use free_inode[1] callback to free any special
metadata associated with the inode instead of relying on
super_operations?

[1] https://elixir.bootlin.com/linux/v6.11/source/include/linux/fs.h#L719

> ...


>
>         if (size <= 0 || !PAGE_ALIGNED(size))
>                 return -EINVAL;
> --
> 2.46.0.598.g6f2099f65c-goog
>